Weekly Shonen Jump #538

When was Weekly Shōnen Jump #538 published?

Weekly Shōnen Jump #538 has a cover date of April 20, 1979 (it went on sale earlier, on March 22, 1979), published by Shueisha in Japan.

Which manga series were featured in Weekly Shōnen Jump #538?

Weekly Shōnen Jump #538 (cover-dated April 20, 1979) featured The Maskman, Honjitsu no Hairai Shima, among other ongoing serializations.